The corner of the house could use some beveling, the reference corner isn’t as sharp as the model.
The metal bracket superkoop mentioned looks too prominent and too undefined with the same texture as the lamp bracket. In the reference, we see several abandoned lamp or sign brackets, which give the t shaped bracket some context, but in the model, it’s just there by itself, everything else has a current purpose.
Ah, well, I see you’re done but for the tweaking. Consider tweaking the bracket material to a less prominent color.